Bump benchmark-ips from 2.8.3 to 2.8.4

Bumps [benchmark-ips](https://github.com/evanphx/benchmark-ips) from 2.8.3 to 2.8.4.
- [Release notes](https://github.com/evanphx/benchmark-ips/releases)
- [Changelog](https://github.com/evanphx/benchmark-ips/blob/master/History.txt)
- [Commits](https://github.com/evanphx/benchmark-ips/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -17,7 +17,7 @@ GEM
   specs:
     any (0.1.0)
     ast (2.4.1)
-    benchmark-ips (2.8.3)
+    benchmark-ips (2.8.4)
     concurrent-ruby (1.1.7)
     diff-lcs (1.4.4)
     docile (1.3.2)